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Instruction Set
3-23
RISC 16−Bit CPU
ADDC[.W] Add source and carry to destination
ADDC.B Add source and carry to destination
Syntax ADDC src,dst or ADDC.W src,dst
ADDC.B src,dst
Operation src + dst + C −> dst
Description The source operand and the carry bit (C) are added to the destination operand.
The source operand is not affected. The previous contents of the destination
are lost.
Status Bits N: Set if result is negative, reset if positive
Z: Set if result is zero, reset otherwise
C: Set if there is a carry from the MSB of the result, reset otherwise
V: Set if an arithmetic overflow occurs, otherwise reset
Mode Bits OSCOFF, CPUOFF, and GIE are not affected.
Example The 32-bit counter pointed to by R13 is added to a 32-bit counter, eleven words
(20/2 + 2/2) above the pointer in R13.
ADD @R13+,20(R13) ; ADD LSDs with no carry in
ADDC @R13+,20(R13) ; ADD MSDs with carry
... ; resulting from the LSDs
Example The 24-bit counter pointed to by R13 is added to a 24-bit counter, eleven words
above the pointer in R13.
ADD.B @R13+,10(R13) ; ADD LSDs with no carry in
ADDC.B @R13+,10(R13) ; ADD medium Bits with carry
ADDC.B @R13+,10(R13) ; ADD MSDs with carry
... ; resulting from the LSDs